| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique capable of more safely carrying out an automatic maintenance work at the equipment while promoting work efficiency. SOLUTION: Jet fans 3, a plurality of lighting fixtures 4 and fire alarms 5 as the equipment necessary for automobiles to pass through a roadway 2 are set in a tunnel 1. The maintenance automatic working device 10 is mounted to a rail 6 set in the tunnel 1. A wire cable is mounted to the device 10. By the constitution, the maintenance automatic working device 10 is pulled along the rail 6 by the wire cable to automatically carry out the maintenance work for the equipment.
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